Let the debate begin.

Here we go again. A couple of heavily camouflaged prototypes belonging to BMW have been spotted roaming the public streets. One was a left-hand-drive coupe while the other was its RHD convertible sibling carrying a fabric top, but look closer - especially at the rear window - and it seems as if the car actually had a metal roof concealed underneath the soft top.

But the biggest riddle is the name: 6 or 8 Series? Judging by the prototype’s size, we’re leaning towards the former, but one can never be too sure. We do know the cars had provisional headlights and taillights indicating the two were early test vehicles, so an official introduction of the models won’t occur in the near future.

Some plastic body cladding might be hiding underneath the swirly camouflage, and if that’s the case, it means the cars are actually smaller than they appear, so more reasons to believe we’re dealing with a 6 rather than an 8. Regardless of its moniker, the duo will ride on the CLAR platform like the first-ever 6 Series GT spied earlier this week.

One thing is for sure, BMW is working on a sleek coupe and convertible pair and at the same time it’s preparing the new Z5 cabrio with a fabric roof. The return of the 8 Series after its demise in 1999 would be sweet, but it remains to be seen whether the folks from Bavaria have it on their to-do list. The rather stunning 2014 Gran Lusso Coupe concept designed by Pininfarina might have been a sign of things to come, so there’s a possibility a Mercedes S-Class Coupe fighter with the “8 Series” badge ranks high among BMW’s priorities.

It would make sense for the coupe spotted here to come out first, possibly by the end of next year, with its convertible sibling scheduled to arrive later on in 2018.